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Politics : Politics of Energy

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To: Thomas A Watson who wrote (39977)	5/23/2013 5:54:40 PM
From: Eric	Read Replies (1) of 86356

The vast majority of direct solar radiation from the sun to the earth gets all the way to the ground: Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux. Bright sunlight provides illuminance of approximately 100,000 lux or lumens per square meter at the Earth's surface. The total amount of energy received at ground level from the sun at the zenith is 1004 watts per square meter, which is composed of 527 watts of infrared radiation, 445 watts of visible light, and 32 watts of ultraviolet radiation. At the top of the atmosphere sunlight is about 30% more intense, with more than three times the fraction of ultraviolet (UV), with most of the extra UV consisting of biologically-damaging shortwave ultraviolet. [3] [4] [5] en.wikipedia.org About 1366 watts/sq meter srikes the upper atmosphere and more than 1000 watts/sq meter gets to the ground. The atmosphere absorbs most of the remainder. en.wikipedia.org

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